Give your work more validity, power in court, and makes it easier to promote. Did you know that, as the original creator of a work, you already have rights to your work without a formal copyright? So, if you automatically get rights to your work, what's the point of registering a copyright?
Validity: Registering your work with the Library of Congress validates your work in a way that few other things can. It shows that you take your work seriously and makes it easier for you to sell your work as a professional, not an amateur.
In Court having a copyright gives to a TON more power in court should you either:
A) have someone infringe on your copyright and you have to sue them,
or
B) even worse, have someone else claim they were the original creator and try to sue you. By creating a copyright, you can establish a date of creation and prove that you created your work before the other party. You also qualify for statutory damages in a court of law (meaning you can receive a lot more money should someone infringe on your copyright).
Promoted through Public Record: When you file a copyright, the U.S. Library of Congress also keeps and promotes a record of your copyright for everyone else to see. This increases the amount of people who will be able to learn about your work and makes it easier for people to discover you.
License Your Work: Copyrights also makes licensing your work a lot easier. By having a copyright registration number, you can more easily define what material you are licensing.
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